[jQuery] retrieving object-property when defining eventhandler

[[EMAIL PROTECTED]]

Hello,
my question is more javascript-relating, but I'm developing my first
jQuery-plugin and try to get to an object-property when I'm defining
an eventhandler in another function.
It looks like this:

someProperty: "property",
doSomething: function(){
    //$(this) is a jQuery object
    //now I define an eventhandler to $(this)'s next element
    $(this).next().keydown(function(){
        //now $(this) is the next-element-object
        //but how to acces .someProperty of the original object?
    });
}

I'm a bit confused, maybe I should take a breath of air ;-)
Thank you in advance!
Marc